What is the percent by weight (w/w%) of sugar in soda? Assume the average mass of sugar in soda is 35.0 g and the total mass is 370.0 g.

law of conservation of matter

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

you need to stop taking that class